Guide · Heat

How hot is too hot to walk your dog?

Guideline values for a healthy dog, not veterinary advice. Last updated: October 1, 2026.

In short: For most dogs, walks become hard work from 75°F (24°C) and risky from 82°F (28°C). In full sun, in humid air, and for flat-faced breeds the limits are much lower: on a sunny day a pug is already on yellow at 61°F (16°C).

And: it is not being outside that causes heatstroke, it is exertion. The bladder has to be emptied at 86°F too, just slowly and in the shade.

The thresholds without sun

How much heat a dog tolerates depends on its build. Flat-faced breeds pant poorly; heavy and long-coated breeds shed heat poorly. Hence three levels:

Heat sensitivity	Examples	Yellow from	Red from
Normal	Labrador, Beagle, Dachshund, Jack Russell, Chihuahua	75°F (24°C)	82°F (28°C)
Elevated	Golden Retriever, German Shepherd, Bernese Mountain Dog, Husky, Poodle, Border Collie	68°F (20°C)	82°F (28°C)
Very high	Pug, French Bulldog, Boxer, Shih Tzu	68°F (20°C)	77°F (25°C)

Yellow means: shorter, slower, shade, water along. Red means: only the essentials, no exertion, no fetch, avoid the midday heat.

Sunshine: minus seven degrees

When the sun is strong enough to heat the pavement above 104°F (40°C), the yellow limit drops by about 7°F (4°C) and the red limit by about 5°F (3°C). A normally sensitive dog is then already on yellow at 68°F (20°C) and on red at 77°F (25°C). This is the best-documented of all the heat rules: at 77°F air and sunshine, asphalt passes 122°F, the point where paws burn. More in the guide on hot pavement.

Under an overcast sky the reduction does not apply. Then the table above counts.

Humidity: when 75°F feels like 82°F

Dogs cool by panting, that is, by evaporation. The more humid the air, the less that works. The measure is the dew point: from about 57°F (14°C) dew point evaporation starts to falter, and each degree above makes the air feel about two thirds of a degree warmer.

Example: 75°F (24°C) air at a 68°F (20°C) dew point, that is, oppressively muggy, feels like 82°F (28°C). For a normally sensitive dog that is red, even though the thermometer shows a harmless number. So look at the dew point or humidity, not only at the temperature.

Why exertion counts

In the case series by Bruchim and colleagues (2006), 63 percent of heatstrokes in dogs were exertional and only 37 percent were caused by ambient heat alone. For your walk this means: a calm stroll in the shade is acceptable even at 82°F. Running, fetch, and jogging alongside a bike are not, from yellow upward.

What helps

Walk early. The coolest hour is just before sunrise; the pavement has cooled overnight.
Shade, grass, trails instead of streets and open ground.
Bring water and offer it, even if the dog does not ask.
No exertion from yellow. No ball, no bike, no roughhousing with other dogs.
Never leave a dog in a car. Not "just five minutes," not with the window cracked.
Know the warning signs: heavy panting with the tongue far out, glassy eyes, staggering, vomiting. Cool the dog immediately, offer water, and get to a vet.

Where the numbers come from

The sunshine rule is documented (asphalt above 122°F at 77°F air and sun). The other limits were set after a professional second opinion: conventions that err on the safe side. The breed table summarizes build, muzzle length, and coat; a Labrador with a heart condition is heat-sensitive even though its breed is not. That is why sensitivity can also be set independently of breed in the app.

In the app

The walk rating does this for your dog.

PawWeather takes temperature, sun, dew point, wind, and weather from the National Weather Service forecast for your spot and shows one level: green, yellow, or red, for every hour of the next 24. With breed and sensitivity it fits your dog rather than any dog. The radar and the rating for a healthy dog are free, no account.